﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class StringUtil
    {
    
            public static string Str { get; set; }

            public static void zf(string str)
            {
                Str = str;
            }
        public static void PrintMsg()
        {
            if (String.IsNullOrWhiteSpace(Str))
            {
                Console.WriteLine("true");
            }
            else if (Str != null)
            {
                Console.WriteLine("false");
            }
        }
        }
}
